diff --git a/tcpdf.php b/tcpdf.php
index a842fbc..645d434 100755
--- a/tcpdf.php
+++ b/tcpdf.php
@@ -9771,7 +9771,7 @@ class TCPDF {
 	 * @param $fontfile (string) TrueType font file (full path).
 	 * @param $fonttype (string) Font type. Valid values are: TrueTypeUnicode, TrueType, Type1, CID0JP = CID-0 Japanese, CID0KR = CID-0 Korean, CID0CS = CID-0 Chinese Simplified, CID0CT = CID-0 Chinese Traditional.
 	 * @param $enc (string) Name of the encoding table to use. Omit this parameter for TrueType Unicode, OpenType Unicode and symbolic fonts like Symbol or ZapfDingBats.
-	 * @param $flags (int) Unsigned 32-bit integer containing flags specifying various characteristics of the font (PDF32000:2008 - 9.8.2 Font Descriptor Flags).
+	 * @param $flags (int) Unsigned 32-bit integer containing flags specifying various characteristics of the font (PDF32000:2008 - 9.8.2 Font Descriptor Flags): +1 for fixed font; +4 for symbol or +32 for non-symbol; +64 for italic.
 	 * @return (string) TCPDF font name.
 	 * @author Nicola Asuni
 	 * @public
@@ -9810,7 +9810,7 @@ class TCPDF {
 			}
 		}
 		// set encoding maps (if any)
-		$fmetric['enc'] = $enc;
+		$fmetric['enc'] = preg_replace('/[^A-Za-z0-9_\-]/', '', $enc);
 		$fmetric['diff'] = '';
 		if (($fmetric['type'] == 'TrueType') OR ($fmetric['type'] == 'Type1')) {
 			if (!empty($enc) AND ($enc != 'cp1252') AND isset($this->encmaps->encmap[$enc])) {